Plaster-board composition.



' 106. COMPOSITIONS,

LXIml UNITED STATES PATENT OFFICE.

JOHN W. VOGLESONG, OF ELYRIA, OHIO,

ASSIGNOB TO PITTSBURGH PLATE GLASS PLASTEB-BOARD COMPOSITION.

No Drawing.

To all whom it may concern Be it known that I, JOHN W. VooLnsoNG, a citizen of the United States, residing at Elyria, Ohio, have invented certain new and useful Improvements in Plaster-Board Compositions, of which the following is a specification.

The invention has reference to compositions for use in the formation of the fiat sheets of material known as laster board, it being understood, however, 1a 'tli'e material or composition is also applicable in the formation of partition blocks and other analogous articles.

The most important of the objects of my present invention is the provision of a composition capable of forming a board of the character specified of greater strength than those ma de according to processes heretofore employed, and which will also stand shipment better than those heretofore produced; and the provision of a composition which by reason of the elements used, permits of a material reduction in the time necessary to compact the material into a board where such compacting is accomplished by what is known as the hydro-press method.

The above as well as such other objects as may hereinafter appear I attain by combining with plaster of Paris and a sufiicient quantity of water, a certain amount of cement, and adding to the whole some kind of strengthening material or binding substance, such for example as wood fiber which is the 35 material I prefer. a

In experimenting I find that a proportion which gives good results is about nige gf.

laster tp ong of cement with a compara lively small amoun 0 wood fiber and just enough"water to carryoutf he operation of inanufaciurmg the board and cause the pies:

tfiftO set properly, it being necessary of course where the hydroress method of manufacture so calle 1s emp oyed, to drive a certain amount of water through the deosited material when the substances have en mixed and the material deposited on the necessary form, and I find that the addition of the cement permits the water to pass through the composition with greater rapidity and, as indicated, very materially reduces the time necessary in the formation Specification oiletters Patent.

Application filed August 8, 1908. Serial No. 447,551.

Patented July 8, 1913.

of the board, in some cases even cutting it down one-half or more, thus enormously increasing the facility with which the boards can be turned out of any given machine. In the hydro-press method, a mixture of the composition together with a large amount of water is subjected to air pressu ge driving the composition against foraminous formers in such way that the solid particles are deposited in a uniformly mixed and distributed mass, each particle being subjected to pressure as it is deposited. A board is thus produced which is unifor 1' co acted throughout the mass. Such a hard 1s very much stronger and more durable than one in which the material is merely allowed to harden without compacting, or in which pressure has been applied only to the exterior surfaces of the formed board leaving the interior comparatively soft.

I find that good results are also obtained by adding to the wood fiber some small quantity of a 'er scra or small pieces, the paper apparently tending to aid the fiber in binding the whole into a solid mass when formed.

finhlly put to ether n the last stage of the 1' operation. e cemefit iii 'tlie composition no increases the rapidity with which approximately nine parts 9f paastmmg to giggff cement wit da rig ativtely small amount 0 wood r an su clen Y water to wet the mixture? In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

JOHN W. VOGLESONG. Witnesses:

WILSON Rooms, H. Wnms.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratents,

Washington, D. 0. 

